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2 definitions by *jedi wave* You don't need to know who I am

 
1.
The visible by-product when a woman wears a bra/corset/top that pushes her breasts together.
Sometimes used purposly as an attraction technique when tartish girls want shallow guys attentions.
guys in club: "God, look at her cleavage in that top!"
Girl (upon hearing comment): " Hi, wanna buy me a drink *stupid high pitched giggle*"
 
2.
1.Lead singer and front man for the American rock/punk band Green day.

Side note to all above definers... teenybop fucks, got over yourselves!
You cheapen music you stupid whores
Billie Joel Armstrong comes up with some kick ass lyrics.